[1] Dana Farber Canc Inst, Ctr Community Based Res, Boston, MA 02215 USA
[2] Univ Massachusetts, Dept Publ Hlth, Amherst, MA 01003 USA
[3] Harvard Univ, Sch Publ Hlth, Dept Soc Human Dev & Hlth, Boston, MA 02115 USA
[4] NYU, Med Ctr, New York, NY 10016 USA
[5] Brigham & Womens Hosp, Dept Dermatol, Boston, MA 02115 USA